The second author was supported by the Natural Science Foundation of China ( 11171129 ) and by Doctoral Fund of Ministry of Education of China ( 20130144110001 ); The third author’s research was supported in part by NSA grant H98230-12-1-0226 .
机构署名：
本校为第一机构
院系归属：
数学与统计学学院
摘要：
A (c(1), c(2), ... , c(k))-coloring of G is a mapping phi : V(G) over right arrow {1, 2, ... , k} such that for every i, 1
